Ventricular septal defect is a type of congenital heart disease that can only be diagnosed through an echocardiogram. Routine prenatal screenings cannot detect it. Particularly for newborns, it’s advisable to have an echocardiogram, and for fetuses, a four-dimensional ultrasound is recommended. Sometimes, ultrasound results can only serve as a reference and may not indicate actual problems, but there is also a certain margin of error. If a child has congenital heart disease, it is advisable to have regular echocardiogram check-ups at the hospital. This allows timely identification of the cause, and determination of whether surgery is necessary for treatment, which is the ultimate goal.